Why Most People Get It Wrong
Many people quickly choose glasses 3, 4, or 7, assuming they are positioned to fill first. However, this puzzle is not really testing speed—it’s testing attention to detail.
The Hidden Detail
If you look closely, every possible path for the water is blocked.
- Glasses 1 and 5 have blocked outlets.
- Glass 2 is blocked at the end of its pipe.
- Glasses 3, 4, and 7 have blockages in the middle of their tubes.
- Glass 6 isn’t connected to any pipe at all.
Because every route is obstructed, the water has no way to reach any glass.
The Correct Answer
No glass will be filled.
Once you realize this, the solution seems obvious, but most people miss it because they assume the puzzle must have an active result.
Why These Puzzles Work
They rely on two common human tendencies:
- assuming something must happen
- overlooking small obstacles while searching for a quick answer
- Instead of asking where the water will go, the real question is where it cannot go.
